function ValidateSignupForm() {
   if(isEmpty(document.SignupForm.Name.value)) {
      window.alert('Please enter your name.');
      document.SignupForm.Name.select();
      return false;
   }
   if(isEmpty(document.SignupForm.Email.value)) {
      window.alert('Please enter your email address.');
      document.SignupForm.Email.select();
      return false;
   }
   if(!isEmail(document.SignupForm.Email.value)) {
      window.alert('Please enter a valid email address.');
      document.SignupForm.Email.select();
      return false;
   }
   if(isEmpty(document.SignupForm.Phone.value)) {
      window.alert('Please enter your contact phone number.');
      document.SignupForm.Phone.select();
      return false;
   }
   return true;
}